Webadvantage of ZERODUR® in comparison to other optical glasses is that the material can be produced in very large dimensions and has a very low thermal expansion coefficient. Figure 1 shows a 1.33 m testing lens for the secondary mirror of GRANTECAN. In figure 7 a 1.5 m diameter ZERODUR® blank in optical standard grade is displayed. WebBy default, the mean coefficient of thermal expansion (CTE) of ZERODUR® is measured within the temperature range of 0°C to 50°C ZERODUR® Brochures & Datasheets Forms of Supply Cut discs Rectangular blocks Prisms Rods Complex cut piece geometry Light-weighting optional Common Applications
Thermal Expansion of Borosilicate Glass, Zerodur, Zerodur M, …
WebAug 20, 2009 · Statistics of CTE homogeneity measurements on a ZERODUR® boule suitable for an economical production of ELT mirror substrates using the improved dilatometer will be presented. It will be shown, that it is possible to achieve tight CTE specifications by utilisation of processes existing at SCHOTT, while at the same time … WebThe first monolithic ZERODUR 4 m class mirror was ordered by the German Max Planck Institute for Astronomical Physics in 1968. A ratio of 1:6 for thickness to diameter ratio ensured the necessary stiffness to minimize deformation under gravity load. ... The CTE homogeneity, the internal quality regarding striae, bubbles and inclusions as well ... bjs wake forest
Lithographic apparatus and device manufacturing method
Webassessment of CTE homogeneity over any part. Mask Substrates Glass is readily available today that meets SEMI Draft 3148 class A specifications for CTE homogeneity which is ±5ppb/K. ... “Delayed Elastic Effects in the Glass Ceramic Zerodur and ULE at Room Temperature,” Applied Opt., 30 [22], 3087-3088 Aug 1, 1991. ... WebJan 5, 2024 · Zerodur as a lithium‑aluminum-silicate-glass ceramic is a mixture of crystalline and amorphous phases. The crystalline phase is about 70 to 75 wt% and has a grain size of approximately 50 nm [4]. The state-of-the-art processes for structuring glass ceramics, especially for Zerodur for macroscopic and optical elements, is milling and polishing [5]. WebThe Crossword Solver found 30 answers to "The Cote d'Azur, e.g.", 10 letters crossword clue. The Crossword Solver finds answers to classic crosswords and cryptic crossword … bjs vacations scam